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A keyboard that you use to control (play) other instruments (like a
rackmount synth, or a sampler in Reason, via MIDI) is called a Master
Keyboard, or a Master Controller, or a Controller Keyboard... and
maybe another 3 names or so 
Anyway, it is a Controller, because it controls other instruments.
A PhatBoy, or a Kenton Control Freak are controllers you use to
change parameter values of MIDI Continuous Controllers (MIDI cc's) on
another instrument (like the Filter Cutoff value in Reason, or for
example the Modulation amount of a rackmount sampler).
All of the above are controllers, they control other instruments.
But they also allow to control different things... it would be
difficult to control a MIDI cc with the keys of your keyboard..., a
knob or a slider is better suited for this kind of task. At the other
hand, imagine having to control your notes with a pair of knobs or
sliders... piano playing is already pretty difficult, but this would
make it impossible to play 
So far my story about controllers...
Another small thing is the term "MIDI Keyboard". This term is just
open for different interpretations... it's either a controller, or a
keyboard that you can control via MIDI (for example play sounds from
it that are driven by MIDI messages from Cubase).
It can also be both: A number of classic keyboards just have a
fantastic playing action, have MIDI I/O, so they are both used as
sound source AND as Master Keyboard. Probably the best example of
this is the Sequential Circuits T8 (yes the same company as the
Prophet 5), which still has one of the best and most advanced full
weighted action implementations that exist.
Here are some cool articles on the subject:
http://www.sospubs.co.uk/sos/Mar02/...control0302.asp
http://www.sospubs.co.uk/sos/Oct01/...usician1001.asp
http://www.sospubs.co.uk/sos/1997_a...ontrollers.html
Hope this helps you out a bit!
Greetz,
CoolRunning
PS. If you have (almost) no money..., save a bit and go for a
controller like the MidiMan Oxygen8, it's only 135 Euro, it's small,
but has keys and knobs... if you're currently working with a mouse
alone, you'll never regret having bought a capable controller!
Last edited by CoolRunning on Sep-23-2002 at 15:31
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